MCP3425 datasheet(20/38 Pages) MICROCHIP

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MCP3425

DS22072B-page 20

5.6.5

ACKNOWLEDGE AND NON-

ACKNOWLEDGE

The Master (microcontroller) and the slave (MCP3425)

use an acknowledge pulse as a hand shake of

communication for each byte. The ninth clock pulse of

each byte is used for the acknowledgement. The clock

pulse

always

provided

the

Master

(microcontroller) and the acknowledgement is issued

by the receiving device of the byte (Note: The

transmitting device must release the SDA line during

the acknowledge pulse.). The acknowledgement is

achieved by pulling-down the SDA line “LOW” during

the 9th clock pulse by the receiving device.

During

reads,

the

Master

(microcontroller)

can

terminate the current read operation by not providing

an acknowledge bit (not Acknowledge (NAK)) on the

last byte. In this case, the MCP3425 device releases

the SDA line to allow the Master (microcontroller) to

generate a STOP or repeated START condition.

The

non-acknowledgement

(NAK)

issued

providing the SDA line to “HIGH” during the 9th clock

pulse.

FIGURE 5-5:

Data Transfer Sequence on I2C Serial Bus.

SCL

SDA

(A)

(B)

(D)

(A)

(C)

START

CONDITION

ADDRESS OR

ACKNOWLEDGE

VALID

DATA

ALLOWED

TO CHANGE

STOP

CONDITION

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